1 files changed, 18 insertions, 2 deletions

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 6a30252cd79f..b03373fd05ca 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1907,11 +1907,27 @@ static void quirk_netmos(struct pci_dev *dev)
 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_NETMOS, PCI_ANY_ID,
                          PCI_CLASS_COMMUNICATION_SERIAL, 8, quirk_netmos);
 
+/*
+ * Quirk non-zero PCI functions to route VPD access through function 0 for
+ * devices that share VPD resources between functions.  The functions are
+ * expected to be identical devices.
+ */
 static void quirk_f0_vpd_link(struct pci_dev *dev)
 {
-        if (!dev->multifunction || !PCI_FUNC(dev->devfn))
+        struct pci_dev *f0;
+
+        if (!PCI_FUNC(dev->devfn))
                 return;
-        dev->dev_flags |= PCI_DEV_FLAGS_VPD_REF_F0;
+
+        f0 = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+        if (!f0)
+                return;
+
+        if (f0->vpd && dev->class == f0->class &&
+            dev->vendor == f0->vendor && dev->device == f0->device)
+                dev->dev_flags |= PCI_DEV_FLAGS_VPD_REF_F0;
+
+        pci_dev_put(f0);
 }
 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
                               PCI_CLASS_NETWORK_ETHERNET, 8, quirk_f0_vpd_link);